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Fletcher, G. J. O.; Simpson, J. A.; Campbell, L.; Overall, N. C. . (2015). Pair-Bonding, Romantic Love, and Evolution: The Curious Case of Homo sapiens. Perspectives on Psychological Science, 10(1), 20–36. doi:10.1177/1745691614561683 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research